Air filter



-Mn;.y 22, 1923. 1,456,360

' A. BUDIL AIR FILTER.

Filed Aug. 30 1921 Fig".

-' Inven r.-

Patented May 22, 1923.

.UNITED STATES PATENT OFFICE.

7 mm 31113112, OF BEBLIN-TEMPELHOB, Gm.

AIR FILTER.

. Application filed August 80, 1921. Serial I0. 498,987.

To all whom it may concern.-

Be it known that I, Anrmzn Boom, a citizen of the Czechoslovakian. Repubhc, residing at Berlin-Tempelhof and State of German have invented certain new and useful provements in an Air Filter, of which the following is a specification.

My invention, relates to an air filter w 1th undulating, zigzag or similar surfaces which 10 are covered with filtering material and which are traversed transversely b the air to be purified. The object of the mventlon is to make space economizin use of loose or layers of filtering materi (e. g. filhng materials or plates of metal, stoneware, porcelain, glass, etc.) peculiar to these filters also capable f being useduwhere hitherto pocket filters covered with woven fabrics were necessa To attain this end each undulation or t e part of the undulation covered with the filtering material is arranged according to the invention so as to be capable of being withdrawn with respect to the course of the undulation, so that the advantages of the filters with undulating surfaces which are covered with loose filtering material are combined withthe advantages of the pocket filters which are covered with woven fabrics. The best filtering action is secured when the part of the undulation which drops towards the pure air side is used as a filtering surface, as in consequence of the congestion of the air between the inclined halves of the undulation the excess of pressure in the intermediate spaces which taper in the shape. of a wedge towards the pure air side is higher than it is on the side where the air enters, so that the height of the layer of the filtering material increases from the dust laden air side to the pure air side in accordance with the increase in the pressure. According as the crests of the undulations are turned towards the dust laden or the pure air side, so the lower or upper part of the undulation is made a filter. The parts of the undulations may be advantageously divided into crests of undulations and the edge of the one part of the undulation which lies outside on the dust laden air side is provided with a bent or curled over part which embraces the adjacent boundary edge of the other part of the undulation. The surfaces so separated may be pivotal! suspended which secures the additional vantage that after removal of the filter surface for the purpose of cleanin 't, the solid surface associated with it can dropped down and used to close up the empty chamber.

Several constructional forms of the invention are shown in the drawing in Figure 1 is a longitudinal section on the line A-B ofFigure 2 of the constructional form in which the filter consists of separate transversely removable undulations the :lfower parts-of which form the filtering suraces.

Figure 2is a section on the line C-D of Fignre l and Figure 3 is a side elevation.

Fi re 4 is a longitudinal section on the line F of Fi 5 of another constructional form in w oh the upper part of the undulation acts on the filtering surface. 76

Figure 5 is a section on the line G-H of Figure 4 and Figure 6 is a side elevation.

Figural}? shows a third constructional form inlongitudinal section on the line I-K f Figure 8, in which the undulations are divided and the lower part which forms the filtering surface is removable.

Figure 8 is asection on the line L-M of Figure 7 and Figure 9 is a side elevation.

Figure 10 shows a further constructional form in section on the line NO of Figure 11, in which the divided parts of the undulations are pivotally suspended.

Figure 11 is a section on the line PQ of Figure 10 and V Figure 12 is a side elevation.

The direction in which the air flows, is indicated by arrows, the dust laden air chamber being on the left and the pure air chamber on the right.

As shown in Figures 1 to 3 the several undulations a are pressed and packed against the supporting frame d by means of the bars f,'the screws g and the fixed side supports h. The supporting frame is closely connected at its periphery with the walls of the chamber which enclose the filter. The filtering layer 2 is spread out on the the entire available filtering surface are. equalized by the fact that the height of the layer is greater at :1: than at 3 corresponding to the increase in the pressure. I

In the constructional form shown in Fi res A to 6 in which the crest of the ungiilations a is turned towards the pure air side, the upper part c is made the sieve and covered with the filterin material e.

The method of removal andt e height of the layer are the same as in the first constructional form.

In the constructional form shown Figures 7 to 9 the parts I) and 0 in the crest of the undulation are made in two parts and the edge of the part 'b of the undulation which is on the outside with respect to the dust laden air side is provided witha bent or curled over part m which embraces the adjacent boundary edge at of the other part of the undulation. For the purpose of bet-- ter engagement the edge 11. may be bent up in the form of'a hook. The filtering material is preferably piled up to such a height that it covers over the connecting and abutting 'oints. This division ensures that only the tering surface 1) needs to be withdrawn for the purpose of cleaning on the dust laden air side. The up er partsc of the undulations are held by t e supporting walls is.

In the constructional form shown in Figures 10 to 12 both parts I) and c of the undulations are pivotall suspended on axles Z on the pure air side t c said axles 2 being carried in hearings in the side supporting walls is. In consequence hereof not only can the part b of the undulation which acts as the ltering surface be removed but after it has been removed the solid surface assigned to it can be also dropped down after which it serves to close the empty chamber as is indicated by dot and dash lines in Figure 10.

What I claim is 1. A .gas filter comprising a plurality of perforate and imperforate plates alternat-- ing 'with each other in vertical zigizag arrangement defining substantially -shaped inter-spaces and a flange extending n wardly from the lower edge of each per 0- rate plate to form a retaining wall for filtering material thereon.

2. A gas filter com rising a plurality of perforate and iinper crate plates alternatneeaeee ing with each other in vertical zigzag arrangement defining substantially V-shaped inter-spaces, a fiange' extending upwardly from the lower edge of each perforate plate to form a retaining wall for filtering material thereon and means for permitting removal of each perforate plate independently of the others. 7

3. A gas filter com rising a plurality of perforate and imper orate lates alternatmg with each other in vertical zi -zag arrangement defining substantially -shaped -inter-spaces, the said interspaces being entirely open at the side determined by the higher edges of the perforate plates and, partly closed at the side determined by the lower edges of the perforate plates by closing means extending upwardly therefrom.

4. A gas filter com rising a plurality of erforate and impe crate plates alternatmg with each other in vertical zig-zag ar rangement defining substantially V-shaped inter-spaces and means for detachabl connecting the perforate lates between t e adjacent imperforate p ates.

5. A gas filter comprising a frame including two side walls and open ends, a plurality of perforate and imperforate plates alternating with each other between the side walls in vertical zig-zag arrangement defining substantially V-shaped interspaces in the direction of the 0 en ends and means for detachably connecting the perforate plates between the adjacent imperforate plates to make them separately re-' movable from one of the open ends.

6. Construction according to claim 5 in which the lower ed e of each imperforate plate is curved defining a hook portion and the higher end of each perforate portion is bent for engagement with said hook portion.

7. A gas filter comprisin a frame includin two side walls and open ends, a plurality of alternately perforate and im- 11o perforate portions pivotally mounted between the side walls in zig zag relation defining substantially V-shaped inter-spaces opening in the direction of the open ends and the erforate plates being dctachably disposed hetween the adjacent imperforate plates.

8. Construction according to claim 7, in which each imperforate plate and the adjacent perforate plate above it have pivotal movement about the same axis and each perforate plate and the imperforate immediatel above it are detachably interconnecte at their front edges.

4 9. Construction according to claim 8, in which the front edges of the imperforate plates are bent downwardly and rearwardly' defining hook portions adapted to embrace the front edges of the perforate plates.

10. A gas filter comprising a frame ill- 1,4ee,eeo A B.

eluding two side walls and open ends, ameans whereby the perforate plates may plurahty of alternatel perforate and 1mdetached independently of each other. 10 perforate plates exten between theside In testlmon whereof, I aflix my slgnature walls in zlg-zag arrangement, the perforate m presence 0 two wltn 5 plates being upwardly inclined toward the. ALFR'ED BUDIL.

gas stream to be filtered-and 'the front and Witn: 1 rear edges thereof being turned up hr MAX ULLHANN,

maintaining filtering material in plaee, and WALTER Annie. 

